API Extensions Handlers in the superscore

doclzs doclzs at 163.com
Tue Jun 8 10:16:43 UTC 2004

There are two extensions handlers in the superscore:
API extensions handlers and user extensions handlers.

An API can add an API extension to the system 
initialization thread at three points:
immediately prior to driver initialization,
immediately after driver initialization,
and post thread context switch.

Why are these three points? Is there no need to
add API extensions to other points?


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